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About Jim Barnhart
Expertise
Fifty + years in Heating, Ventilating, Air Conditioning, Sheet Metal Manufacturing.
Semi retired since 1995,
Experience
Answer questions about , residential and commercial.
Answer questions about sheet metal fabrication.
Fifty years plus experience.
No answers for oil equipment, No answers for kitchen appliances, No answers for laundry appliances.
Education/Credentials
Hands on since 1950
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You are here: Experts > Home/Garden > Home Appliances > Heating, Air Conditioning, Fridge, HVAC > heater
Expert: Jim Barnhart - 11/1/2009
Question
Hello Jim Barnhart,
I have a Trane XR80, natural gas,forced air furnace, about 7 years old. Right now it has an intermittent problem which I'm sure will only get worse.
When it starts up, the vent fan motor starts, the glow plug comes on (which is all normal), but the burner fails to light - the gas valve isn't opening. Then the blower fan starts blowing right a way and the glow plug goes out. The sequence just skips the lighting of the burner. When it fails to light and just the blower is on, I have to reset the furnace - turn off the power for a few minutes. Sometimes it fixes the problem, sometimes I have to reset again, and some times it will run through a few more cycles after a reset,then I have to reset again.
I know there are two wires coming from the top of the gas valve. It's not really a coil, I'm not sure what it is. Gas valve, pressure switch? WHAT DO YOU THINK???
Thank You,
Rick
Answer
Rick,
Everything you say that is happening is the normal way it should for a furnace that the burner doesn't light
I'm thinking that the igniter may not be positioned close enough to the burner for the burner to light in time before the flame sensor shuts the gas off.
Check the igniters position, check for covers being off causing a draft, check for any obstruction in the burner opening.
If the pressure switch wasn't working the igniter wouldn't glow.
I doubt if it's the gas valve but it's possable, you should be able to hear if any gas flows for a split second if you listen closely.
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